diff --git "a/\355\225\234\352\260\200\354\235\200/10866.py" "b/\355\225\234\352\260\200\354\235\200/10866.py"
new file mode 100644
index 0000000..10d9e95
--- /dev/null
+++ "b/\355\225\234\352\260\200\354\235\200/10866.py"
@@ -0,0 +1,24 @@
+from collections import deque
+import sys
+
+n = int(input())
+answer = deque()
+for _ in range(n):
+    a = list(sys.stdin.readline().split())
+    
+    if a[0] == 'push_front':
+        answer.appendleft(a[1])
+    elif a[0] == 'push_back':
+        answer.append(a[1])
+    elif a[0] == 'pop_front':
+        print(answer.popleft() if answer else -1)
+    elif a[0] == 'pop_back':
+        print(answer.pop() if answer else -1)
+    elif a[0] == 'size':
+        print(len(answer))
+    elif a[0] == 'empty':
+        print(0 if answer else 1)
+    elif a[0] == 'front':
+        print(answer[0] if answer else -1)
+    else : # a == 'back'
+        print(answer[-1] if answer else -1)
\ No newline at end of file
diff --git "a/\355\225\234\352\260\200\354\235\200/15649.py" "b/\355\225\234\352\260\200\354\235\200/15649.py"
new file mode 100644
index 0000000..9f8c30b
--- /dev/null
+++ "b/\355\225\234\352\260\200\354\235\200/15649.py"
@@ -0,0 +1,18 @@
+def back_tracking(arr, len, used_num):
+    if len == m:
+        print(*arr)
+        return
+    
+    for i in range(1, n+1):
+        if not used_num[i]:
+            arr.append(i)
+            used_num[i] = True
+            back_tracking(arr, len + 1, used_num)
+            arr.pop()
+            used_num[i] = False
+
+n, m = list(map(int, input().split()))
+
+nums = [i+1 for i in range(n + 1)]
+used_num = [False] * (n+1)
+back_tracking([], 0, used_num)
diff --git "a/\355\225\234\352\260\200\354\235\200/15650.py" "b/\355\225\234\352\260\200\354\235\200/15650.py"
new file mode 100644
index 0000000..727dfc8
--- /dev/null
+++ "b/\355\225\234\352\260\200\354\235\200/15650.py"
@@ -0,0 +1,14 @@
+def backtracking (arr, start):
+    if m == len(arr):
+        print(*arr)
+        return
+    
+    for i in range(start, n+1):
+        arr.append(i)
+        backtracking(arr, i+1)
+        arr.pop()
+        
+    
+n, m = list(map(int, input().split()))
+s = 1
+backtracking([], s)
\ No newline at end of file
diff --git "a/\355\225\234\352\260\200\354\235\200/4949.py" "b/\355\225\234\352\260\200\354\235\200/4949.py"
new file mode 100644
index 0000000..d937eed
--- /dev/null
+++ "b/\355\225\234\352\260\200\354\235\200/4949.py"
@@ -0,0 +1,28 @@
+import sys
+
+while True:
+    state = True
+    stack = []
+    commands = list(sys.stdin.readline().rstrip())
+    if commands == ['.']: # command는 list이기 때문에 []리스트로 일치 판별
+        break
+    for char in commands:
+        if char == '(':
+            stack.append('(')
+        elif char == '[':
+            stack.append('[')
+        elif char == ')':
+            if stack and stack.pop() == '(':
+                state = True
+            else:
+                state = False
+                break
+        elif char == ']':
+            if stack and stack.pop() == '[':
+                state = True
+            else :
+                state = False
+                break
+    if stack:
+        state = False #stack이 비었을 때만 yes
+    print('yes' if state else 'no')
\ No newline at end of file
diff --git "a/\355\225\234\352\260\200\354\235\200/B10828.py" "b/\355\225\234\352\260\200\354\235\200/B10828.py"
new file mode 100644
index 0000000..2e42fc0
--- /dev/null
+++ "b/\355\225\234\352\260\200\354\235\200/B10828.py"
@@ -0,0 +1,23 @@
+import sys
+
+stack = []
+n = int(sys.stdin.readline())
+for _ in range(n):
+    command = list(sys.stdin.readline().split())
+    if command[0] == "push" :
+        stack.append(command[1])
+
+    elif command[0] == "pop" :
+        if(stack) : print(stack.pop())
+        else : print(-1)
+
+    elif command[0] == "size":
+        print(len(stack))
+
+    elif command[0] == "empty":
+        if(stack): print(0)
+        else : print(1)
+
+    else :
+        if(stack) : print(stack[-1])
+        else : print(-1)
diff --git "a/\355\225\234\352\260\200\354\235\200/B10845.py" "b/\355\225\234\352\260\200\354\235\200/B10845.py"
new file mode 100644
index 0000000..b9dfc7c
--- /dev/null
+++ "b/\355\225\234\352\260\200\354\235\200/B10845.py"
@@ -0,0 +1,18 @@
+import sys
+
+queue = []
+n = int(sys.stdin.readline())
+for _ in range(n):
+    command = list(sys.stdin.readline().split())
+    if command[0] == "push":
+        queue.append(command[1])
+    elif command[0] == "pop":
+        print(queue.pop(0) if queue else -1)
+    elif command[0] == "size":
+        print(len(queue))
+    elif command[0] == "empty":
+        print(0 if queue else 1)
+    elif command[0] == "front":
+        print(queue[0] if queue else -1)
+    else: #back 
+        print(queue[-1] if queue else -1)
\ No newline at end of file